In the past, the scsi_host's number wasn't shown anywhere, user have to
depends on vpg_83 to find the block device, which is also depends on
backstore implementation.
It's better for tcm_loop to provide necessary straightforward information
on locate the block device it created.
This patch would help to locate the block device created by tcm_loop. The
address would be shown at e.g.
/sys/kernel/config/target/loopback/naa.60014059436855c1/tpgt_1/address
which would looks like "2:0:1", and the lun number can be found at
"/tpgt_1/lun/lun_0". Altogether they formated the scsi address of device
as "2:0:1:0", which can be used to locate the device easily through
'lsscsi'.
Signed-off-by: Sheng Yang <sheng@xxxxxxxxxx>
---
drivers/target/loopback/tcm_loop.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 5bc85ff..a38ddd6 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -1046,9 +1046,26 @@ static ssize_t tcm_loop_tpg_store_transport_status(
TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR);
+static ssize_t tcm_loop_tpg_show_address(
+ struct se_portal_group *se_tpg,
+ char *page)
+{
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
+ struct tcm_loop_tpg, tl_se_tpg);
+ struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
+ ssize_t ret = -EINVAL;
+
+ ret = snprintf(page, PAGE_SIZE, "%d:0:%d\n",
+ tl_hba->sh->host_no, tl_tpg->tl_tpgt);
+ return ret;
+}
+
+TF_TPG_BASE_ATTR_RO(tcm_loop, address);
+
static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
&tcm_loop_tpg_nexus.attr,
&tcm_loop_tpg_transport_status.attr,
+ &tcm_loop_tpg_address.attr,
NULL,
};
--
2.1.4
--
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